I have come across a number of comments in forums about asking how to determine what software is using a particular port. This query happens when you are trying to install software which fails due to a port being utilized already. I came across the same query and remembered that I could do this using NETSTAT but couldn’t remember the switches. Well I found the information and thought I would share:-
netstat -aon | findstr
Eg: with port 443
If you kill the related process then the port will be become free.
Note : Normally PID column will not be visible in task manager , but the same you can find in View -> Select columns